In-vehicle augmented reality system

1. A system for displaying visual information to a user of a vehicle, the system comprising: a projection system that includes a set of two or more projectors included in the vehicle, the projection system configured to project at least a first visual output onto a first projection surface of a head-mounted device of the user to cause at least a first portion of the visual information to be displayed to a first eye of the user; a position-tracking system included in the vehicle and configured to determine; a location of the head-mounted device with respect to the projection system, and an orientation of the head-mounted device with respect to the projection system; and a processing unit configured to execute instructions to cause the projection system to: select, from the set of projectors and based on the location and the orientation of the head-mounted device, a first projector, and project, via the first projector, the first visual output to the first projection surface.

2. The system of claim 1 , wherein: the first projector is further configured to project the first visual output to the first projection surface when the head-mounted device is in a first location with a first orientation; and a second projector of the set of projectors is configured to project the first visual output to the first projection surface when the head-mounted device is in a second location with a second orientation.

3. The system of claim 1 , wherein: the head-mounted device includes a second projection surface; the first projector is further configured to project the first visual output to the first projection surface; and a second projector of the set of projectors is configured to project a second visual output to the second projection surface.

4. The system of claim 1 , wherein causing the projection system to project the first visual output to the first projection surface comprises causing the projection system to project, via the first projector and based on the location and the orientation of the head-mounted device, the first visual output in a projection direction.

5. The system of claim 1 , wherein the first projection surface is included in a combiner that is configured to optically modify the first visual output by changing an apparent optical distance of the first visual output from the first eye.

6. The system of claim 5 , wherein the head-mounted device includes an auxiliary optical element configured to direct the first visual output to the first projection surface via the combiner.

7. The system of claim 1 , wherein: the head-mounted device includes a second projection surface; and the projection system is further configured to project a second visual output onto the second projection surface to cause a second portion of the visual information to be displayed to a second eye of the user.

8. The system of claim 7 , wherein the processing unit is further configured to execute instructions to cause the projection system to project the second visual output to the second projection surface, and the first portion of the visual information is different than the second portion of the visual information.

9. The system of claim 8 , wherein the processing unit is further configured to execute instructions to generate the first portion of the visual information and the second portion of the visual information so that the user perceives the visual information stereoscopically.

10. The system of claim 9 , wherein the processing unit is further configured to execute instructions to generate the first portion of the visual information and the second portion of the visual information so that the user perceives at least a portion of the visual information to be located within the vehicle.

11. The system of claim 9 , wherein the processing unit is further configured to execute instructions to generate the first portion of the visual information and the second portion of the visual information so that the user perceives at least a portion of the visual information to be located outside the vehicle.

12. A method for displaying visual information to a user of a vehicle, the method comprising: receiving current location and orientation information for a head-mounted device of the user; determining, based on the current location and orientation information, a transformation function to be applied to image data for display to the user; modifying, based on the transformation function, the image data to generate display data; selecting, from a set of projectors included in a projection system and based on the current location and orientation information, a first projector, wherein the projection system is external to the head-mounted device; and causing, the projection system to project, via the first projector and based on the display data, a first visual output to a first projection surface of the head-mounted device.

13. The method of claim 12 , wherein the current location and orientation information for the head-mounted device is received from a sensor external to the head-mounted device.

14. The method of claim 12 , wherein modifying the image data to generate the display data comprises: generating a first portion of display data for the projection of the first visual output to the first projection surface; and generating a second portion of display data for the projection of a second visual output to a second projection surface of the head-mounted device.

15. The method of claim 14 , further comprising projecting the second portion of display data to the second projection surface.

16. A system for displaying visual information to a user of a vehicle, the system comprising: a projection system that includes a set of two or more projectors configured to be incorporated into the vehicle, and configured to project at least a first visual output onto a first projection surface of a head-mounted device of the user to cause at least a first portion of the visual information to be displayed to a first eye of the user; a position-tracking system configured to be incorporated into the vehicle and configured to determine: a location of the head-mounted device with respect to the projection system, and an orientation of the head-mounted device with respect to the projection system; and a processing unit configured to be incorporated into the vehicle and configured to execute instructions to: generate, based on the location and the orientation of the head-mounted device, the first visual output, select, from the set of projectors and based on the location and the orientation of the head-mounted device, a first projector; and cause the projection system to project, via the first projector, the first visual output to the first projection surface.

17. The system of claim 16 , wherein the set of projectors includes at least one projector configured to be installed on an interior surface of the vehicle.

18. The system of claim 16 , wherein the position-tracking system includes at least one position-tracking sensor configured to be installed on an interior surface of the vehicle.

19. The system of claim 16 , wherein: the first projector is further configured to project the first visual output to the first projection surface when the head-mounted device is in a first location with a first orientation; and a second projector of the set of projectors is configured to project the first visual output to the first projection surface when the head-mounted device is in a second location with a second orientation.

20. The system of claim 16 , wherein: the head-mounted device includes a second projection surface; the first projector is further configured to project the first visual output to the first projection surface; and a second projector of the set of projectors is configured to project a second visual output to the second projection surface.